Two concentic rings placed in a gravity free free region in yz plane of radius R carries a charge of +Q and second of Radius 4R and charge -8Q distributed uniformly over it. Find the minimum velocity with which a point charge of mass m and charge -q should be projected from a point at a distance 3R from the centre of the rings on its axis so that it will reach to the centre of the rings.

Srijit singh , 15 Years ago

Grade 12